Dolphin Limiting Factors

WartedEmperor · 20th October 2008, 00:09

Drager Dolphin

0 to 17 msw 125 min with 60% O2 and 40% N2
• 0 to 22 msw 95 min with 50% O2 and 50% N2
• 0 to 30 msw 67 min with 40% O2 and 60% N2
• 0 to 40 msw 47 min with 32% O2 and 68% N2

What is limiting the bottom time for these times? Is it the scrubber or the tank size?

If it is the tank size and I put a bigger tank on it what is the biggest size i could put on?

What is the scrubber duration?

**OceanOpportunity** · 20th October 2008, 01:38

the Dolphin has a decent scrubber. It is tested at about 3 hrs/40msw. Those #'s look like gas duration. more gas, more duration...pretty simple.

4ster · 20th October 2008, 02:02

Is this a test? Ok, I'll bite:

It looks like the times are the estimates for emptying a 4 liter cylinder.

Depending on your location, Drager made 5 liter cylinders but they are not available in the USA. I have used a Worthington 40 cf (apx 5.9 liters) cylinder and have heard of people using Aluminum 50s (apx 6.9 liters).

The short answer for the scrubber duration is 3 hours.

Steve

Quote: (Originally Posted by WartedEmperor)

Drager Dolphin

0 to 17 msw 125 min with 60% O2 and 40% N2
• 0 to 22 msw 95 min with 50% O2 and 50% N2
• 0 to 30 msw 67 min with 40% O2 and 60% N2
• 0 to 40 msw 47 min with 32% O2 and 68% N2

What is limiting the bottom time for these times? Is it the scrubber or the tank size?

If it is the tank size and I put a bigger tank on it what is the biggest size i could put on?

What is the scrubber duration?

Numpty diver · 20th October 2008, 06:54

you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit.
Extends your times and gives you some extra gas for suit inflation and bcd .
Dean

jmurba · 20th October 2008, 15:07

Quote: (Originally Posted by Numpty diver)

you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit.
Extends your times and gives you some extra gas for suit inflation and bcd .
Dean

I've dived for at least one year using a stell 8 liters tanks in scr mode....for me it was a nigthmare , I went back home after diving with horrible backakes.
a ten steel ten liter would be enven worth.
in addition you have to consider that your ABS shell won't resist long holding such a big tank.
I went back to the 5 liter quite fastly...then I used a second Nitrox stage to feed a ray by pass with N40.
the ray by pass was connected to the oxygauge port I did not use cause my sensors were in a T on the inhalation hose.
so I had the 5 liter as a bottom gas tank (I used 25/35 TX) on the Nx 32 jet wich gave me a 20lt/mn flow rater and a 6 liter nitrox tank.

of course I switched to kiss style soon after and used to have time limitations except the scrubber time of course.

regards

jean mi

Numpty diver · 20th October 2008, 19:38

Hei jean
the shell doesnt completly support the tank, the harness does.
spent a lot of time getting my trim correct then things balenced out ok for me.
I like the dolphin as a fun uncomplicated scr , which i still use.

I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though.
Dean

gibbogeo · 20th October 2008, 22:12

Quote: (Originally Posted by jmurba)

in addition you have to consider that your ABS shell won't resist long holding such a big tank.

I broke myne quite immediately with a 8 liter steel tank.

Then i installed a second bypass from the ray (seems it is quite common!) and bought an aluminium shell from New Zealand.

WartedEmperor · 20th October 2008, 23:08

Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price?

Also how hard and expensive are they to convert over to a CCR?

jmurba · 21st October 2008, 07:19

Hi Dean

Quote: (Originally Posted by Numpty diver)

Hei jean
the shell doesnt completly support the tank, the harness does.
spent a lot of time getting my trim correct then things balenced out ok for me.
I like the dolphin as a fun uncomplicated scr , which i still use.

++++ trim is the very problem of the dolphin configuration, I ended up with a 3 kg lead bar on the top of my home made shell and 2 2kg soft lest pockets on top of the harness stripes and now I am swiming like a fish .
I've dive the dolphin for years I love it simplicity provided I don't have to undo it at everydive, I only take of the canister and then rince it like this without even removing the tanks, I let the dolphin drying uprigth in the garage , and it is ok.

I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though.
Dean

to be honest 1500 euros for a used dolphin, 1000 euros of parts ....it is exactly the price of an OR ...
kissing a dolphin used tyo be a bargain....if alex keeps his price where it is...
I will keep my "dolphin", but I will buy an OR for the rare time I go in clubs and if the OR make my life easier I will leave my dolphin in the garage...well if I can consider my dolphin as a dolphin and if you visit my web you will see it is not obvious.

regards

jean mi

jmurba · 21st October 2008, 07:24

Quote: (Originally Posted by WartedEmperor)

Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price?

Also how hard and expensive are they to convert over to a CCR?

about 1500 euros at tecme if you get a sensor holder , an oxymeter, the sensors, the hydrogom valve, the oxy reg, the spanner, the shell.

if you add it to the price of a used dolphin....it will mean 3000 euros...where the OR is 2500....

ihmo it is time to wait cause either the third parts maker will low their price either they will go bankrupt

20th October 2008, 00:09	#1 (permalink)
WartedEmperor RBW Member Join Date: Feb 2008 Posts: 21	Dolphin Limiting Factors Drager Dolphin 0 to 17 msw 125 min with 60% O2 and 40% N2 • 0 to 22 msw 95 min with 50% O2 and 50% N2 • 0 to 30 msw 67 min with 40% O2 and 60% N2 • 0 to 40 msw 47 min with 32% O2 and 68% N2 What is limiting the bottom time for these times? Is it the scrubber or the tank size? If it is the tank size and I put a bigger tank on it what is the biggest size i could put on? What is the scrubber duration?
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20th October 2008, 01:38	#2 (permalink)
OceanOpportunity for a world of water rEvo II mCCR/SW Predator Join Date: Nov 2006 Location: Providence, RI USA Posts: 1,334	Re: Dolphin Limiting Factors the Dolphin has a decent scrubber. It is tested at about 3 hrs/40msw. Those #'s look like gas duration. more gas, more duration...pretty simple. __________________ Michael Lombardi .: bringing you an Ocean of Opportunity .: Undersea Resource Center \| Ocean State .: Blog \| A New Life in the Sea .: Diving Safety Officer \| American Museum of Natural History ------------------------------- *proud supporter* Ocean Opportunity Inc. \| a 501(c)3 not for profit organization Add your support with every purchase when you use the Ocean Opportunity Platinum® Visa Rewards card
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20th October 2008, 02:02	#3 (permalink)
4ster Steve Sprague rEvo Dolphin Join Date: Mar 2006 Location: The Soviet of Washington Posts: 527	Re: Dolphin Limiting Factors Is this a test? Ok, I'll bite: It looks like the times are the estimates for emptying a 4 liter cylinder. Depending on your location, Drager made 5 liter cylinders but they are not available in the USA. I have used a Worthington 40 cf (apx 5.9 liters) cylinder and have heard of people using Aluminum 50s (apx 6.9 liters). The short answer for the scrubber duration is 3 hours. Steve Quote: (Originally Posted by WartedEmperor) Drager Dolphin 0 to 17 msw 125 min with 60% O2 and 40% N2 • 0 to 22 msw 95 min with 50% O2 and 50% N2 • 0 to 30 msw 67 min with 40% O2 and 60% N2 • 0 to 40 msw 47 min with 32% O2 and 68% N2 What is limiting the bottom time for these times? Is it the scrubber or the tank size? If it is the tank size and I put a bigger tank on it what is the biggest size i could put on? What is the scrubber duration?
(Offline)

20th October 2008, 06:54	#4 (permalink)
Numpty diver Now showing as "Dean Coote" Join Date: Jul 2006 Location: Norway, Bergen Posts: 487	Re: Dolphin Limiting Factors you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit. Extends your times and gives you some extra gas for suit inflation and bcd . Dean
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20th October 2008, 15:07	#5 (permalink)
jmurba wet bear Join Date: May 2006 Posts: 1,000	Re: Dolphin Limiting Factors Quote: (Originally Posted by Numpty diver) you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit. Extends your times and gives you some extra gas for suit inflation and bcd . Dean I've dived for at least one year using a stell 8 liters tanks in scr mode....for me it was a nigthmare , I went back home after diving with horrible backakes. a ten steel ten liter would be enven worth. in addition you have to consider that your ABS shell won't resist long holding such a big tank. I went back to the 5 liter quite fastly...then I used a second Nitrox stage to feed a ray by pass with N40. the ray by pass was connected to the oxygauge port I did not use cause my sensors were in a T on the inhalation hose. so I had the 5 liter as a bottom gas tank (I used 25/35 TX) on the Nx 32 jet wich gave me a 20lt/mn flow rater and a 6 liter nitrox tank. of course I switched to kiss style soon after and used to have time limitations except the scrubber time of course. regards jean mi
(Offline)

20th October 2008, 19:38	#6 (permalink)
Numpty diver Now showing as "Dean Coote" Join Date: Jul 2006 Location: Norway, Bergen Posts: 487	Re: Dolphin Limiting Factors Hei jean the shell doesnt completly support the tank, the harness does. spent a lot of time getting my trim correct then things balenced out ok for me. I like the dolphin as a fun uncomplicated scr , which i still use. I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though. Dean
(Offline)

20th October 2008, 22:12	#7 (permalink)
gibbogeo Gilberto Bonaga, Italy Kiss with Hammerhead Draeger Dolphin Join Date: Sep 2005 Location: italy Posts: 413	Re: Dolphin Limiting Factors Quote: (Originally Posted by jmurba) in addition you have to consider that your ABS shell won't resist long holding such a big tank. I broke myne quite immediately with a 8 liter steel tank. Then i installed a second bypass from the ray (seems it is quite common!) and bought an aluminium shell from New Zealand.
(Offline)

20th October 2008, 23:08	#8 (permalink)
WartedEmperor RBW Member Join Date: Feb 2008 Posts: 21	Re: Dolphin Limiting Factors Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price? Also how hard and expensive are they to convert over to a CCR?
(Offline)

21st October 2008, 07:19	#9 (permalink)
jmurba wet bear Join Date: May 2006 Posts: 1,000	Re: Dolphin Limiting Factors Hi Dean Quote: (Originally Posted by Numpty diver) Hei jean the shell doesnt completly support the tank, the harness does. spent a lot of time getting my trim correct then things balenced out ok for me. I like the dolphin as a fun uncomplicated scr , which i still use. ++++ trim is the very problem of the dolphin configuration, I ended up with a 3 kg lead bar on the top of my home made shell and 2 2kg soft lest pockets on top of the harness stripes and now I am swiming like a fish . I've dive the dolphin for years I love it simplicity provided I don't have to undo it at everydive, I only take of the canister and then rince it like this without even removing the tanks, I let the dolphin drying uprigth in the garage , and it is ok. I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though. Dean to be honest 1500 euros for a used dolphin, 1000 euros of parts ....it is exactly the price of an OR ... kissing a dolphin used tyo be a bargain....if alex keeps his price where it is... I will keep my "dolphin", but I will buy an OR for the rare time I go in clubs and if the OR make my life easier I will leave my dolphin in the garage...well if I can consider my dolphin as a dolphin and if you visit my web you will see it is not obvious. regards jean mi
(Offline)

21st October 2008, 07:24	#10 (permalink)
jmurba wet bear Join Date: May 2006 Posts: 1,000	Re: Dolphin Limiting Factors Quote: (Originally Posted by WartedEmperor) Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price? Also how hard and expensive are they to convert over to a CCR? about 1500 euros at tecme if you get a sensor holder , an oxymeter, the sensors, the hydrogom valve, the oxy reg, the spanner, the shell. if you add it to the price of a used dolphin....it will mean 3000 euros...where the OR is 2500.... ihmo it is time to wait cause either the third parts maker will low their price either they will go bankrupt
(Offline)

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